Compilare: user.cpp: In function ‘int main()’: user.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dq.size() == k) ^ user.cpp:41:23: warning: ‘end’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << start << " " << end << " " << max; ^ user.cpp:41:7: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << start << " " << end << " " << max; ^